CN115629640A - Temperature control panel and external environment temperature detection method - Google Patents
Temperature control panel and external environment temperature detection method Download PDFInfo
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- CN115629640A CN115629640A CN202211138161.8A CN202211138161A CN115629640A CN 115629640 A CN115629640 A CN 115629640A CN 202211138161 A CN202211138161 A CN 202211138161A CN 115629640 A CN115629640 A CN 115629640A
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
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Abstract
The invention discloses a temperature control panel and an external environment temperature detection method, comprising a shell, a main board and an auxiliary board which are arranged in the shell; the auxiliary board comprises an auxiliary circuit board and a main heating device arranged on the auxiliary circuit board; the main board comprises a main circuit board, and an MCU processor, a first temperature sensor and a second temperature sensor which are arranged on the main circuit board, wherein the first temperature sensor is used for detecting the temperature of heat conducted to the main board by the auxiliary board, and the second temperature sensor is used for detecting the temperature of an external environment; the external environment temperature detection method obtains the external environment temperature through the detection of the first temperature sensor and the second temperature sensor, and can effectively improve the detection accuracy of the external environment temperature.
Description
Technical Field
The invention relates to the field of temperature control panels, in particular to a temperature control panel and an external environment temperature detection method.
Background
The intelligent home is a novel household appliance which takes a house as a platform, constructs efficient residential facilities and a management system of family schedule affairs, improves home security, convenience, comfort and artistry, realizes an environment-friendly and energy-saving living environment, generally has a temperature control system, and needs an external temperature control panel to perform manual and automatic control.
Electronic modules such as an MCU (microprogrammed control Unit), a power supply module, a relay, a temperature sensor, a display screen and an indicator light are arranged in an existing temperature control panel, wherein the temperature sensor is used for detecting the temperature of an external environment, other electronic modules can generate a lot of heat in the working process, and the temperature sensor can be heated to generate errors under the influence of the heat; the power module and the relay have the largest calorific value and the largest influence on the temperature sensor; moreover, because the power consumed by the electronic modules is in a dynamic change state in the working process, the error generated by heating the temperature sensor is also in a dynamic change state all the time, so that the temperature control panel cannot correct the temperature value detected by the temperature sensor through a constant compensation quantity, and the conventional temperature control panel cannot accurately detect the external environment temperature.
Disclosure of Invention
The invention aims to provide a temperature control panel and an external environment temperature detection method, which can enable the temperature control panel to accurately detect the external environment temperature.
In order to achieve the above purpose, the solution of the invention is:
a temperature control panel comprises a shell, a main board and a secondary board, wherein the main board and the secondary board are arranged in the shell; the auxiliary board comprises an auxiliary circuit board and a main heating device arranged on the auxiliary circuit board; the main board comprises a main circuit board, and an MCU processor, a first temperature sensor and a second temperature sensor which are arranged on the main circuit board; main circuit board and auxiliary circuit board are connected and the electrical property switches on, and the mainboard is equipped with the MCU treater, first temperature sensor and second temperature sensor, and first temperature sensor is adjacent with the junction of main circuit board and auxiliary circuit board, and second temperature sensor is close to the shell and the shell corresponds and is provided with the detection opening with second temperature sensor, MCU treater and first temperature sensor, second temperature sensor, power module and relay be electric connection respectively.
The main circuit board and the auxiliary circuit board are arranged oppositely side by side, and an interval is formed between the main circuit board and the auxiliary circuit board.
And an insulating thermal baffle is arranged between the main circuit board and the auxiliary circuit board.
The main heating device is arranged on one side of the auxiliary circuit board far away from the main circuit board.
The main heating device comprises a power module and a relay.
The power module is provided with a voltage-regulating power circuit with adjustable output voltage, the auxiliary board also comprises an electronic switch arranged on the auxiliary circuit board, the output end of the voltage-regulating power circuit is electrically connected with the coil of the relay through the electronic switch, the input end and the output end of the electronic switch are respectively electrically connected with the output end of the voltage-regulating power circuit and the coil of the relay, and the control end of the electronic switch is electrically connected with one output end of the MCU processor; the MCU processor is electrically connected with the voltage-regulating power supply circuit and controls the output voltage of the voltage-regulating power supply circuit.
The voltage regulating power supply circuit comprises an input rectifying filter circuit and a voltage reducing circuit; the output end of the input rectifying and filtering circuit is connected with the input end of the voltage reducing circuit; the voltage reduction circuit comprises a PWM control chip U1, a resistor R1, a capacitor CT1, an inductor L1, a freewheeling diode D1 and an adjustable feedback unit, wherein a Drain pin of the PWM control chip U1 is connected with the input end of the voltage reduction unit, a VDD pin of the PWM control chip U1 is connected with the anode of the capacitor CT1, a GND pin of the PWM control chip U1 is connected with the first end of the resistor R1, the cathode of the capacitor CT1, the first end of the inductor L1 and the cathode of the freewheeling diode D1, a CS pin of the PWM control chip U1 is connected with the second end of the resistor R1, the second end of the inductor L1 is connected with the output end of the voltage reduction circuit, and the anode of the freewheeling diode D1 is grounded; the adjustable feedback unit comprises an optocoupler U2, a resistor R3, a resistor R4, a capacitor C1 and a diode D2, wherein the input negative electrode of the optocoupler U2 is grounded, the output positive electrode of the optocoupler U2 is connected with the first end of the resistor R4, the second end of the resistor R4 is connected with the first end of the resistor R2, the first end of the resistor R3 and the FB pin of the PWM control chip U1, the second end of the resistor R2 is connected with the first end of the capacitor C2 and the negative electrode of the diode D2, the positive electrode of the diode D2 is connected with the output end of a voltage reduction circuit, and the second end of the capacitor C2, the second end of the resistor R3 and the output negative electrode of the optocoupler U2 are connected with the GND pin of the PWM control chip U1; the MCU processor is connected with the input anode of the optocoupler U2, and the output end of the voltage reduction circuit of the voltage regulation power supply circuit is electrically connected with a coil of the relay through the electronic switch.
The main circuit board is provided with a main board connector, and the first temperature sensor is arranged adjacent to the main board connector; the auxiliary circuit board is provided with an auxiliary board connector connected with the main board connector.
The first temperature sensor is arranged on one side of the main circuit board close to the auxiliary circuit board.
The second temperature sensor is positioned on one side of the main circuit board far away from the auxiliary circuit board; the second temperature sensor is arranged at the edge of the main circuit board.
The external environment temperature detection method based on the temperature control panel comprises the following steps:
under the external environment with stable temperature, measuring the ratio of a first thermal resistance R1 and a second thermal resistance R2 of the temperature control panel; the first thermal resistance R1 is a thermal resistance of a heat conduction path between the first temperature sensor and the second temperature sensor, and the second thermal resistance R2 is a thermal resistance of a heat conduction path between the second temperature sensor of the temperature control panel and the external environment;
when the temperature control panel detects the temperature of external environment, the first temperature sensor detects the temperature to obtain a first temperature value T1, the second temperature sensor also detects the temperature to obtain a second temperature value T2, and the MCU processor of the temperature control panel substitutes the first temperature value T1, the second temperature value T2, the first thermal resistance R1 and the second thermal resistance R2 into a formula: t0= T2- (T1-T2) × (R2/R1), giving the external ambient temperature T0.
The method for measuring the ratio of the first thermal resistance R1 to the second thermal resistance R2 of the temperature control panel comprises the following steps: place control by temperature change panel and high accuracy temperature sensor in the stable external environment of temperature, then read the external environment temperature value Tz that high accuracy temperature sensor detected and the first temperature value T1 that the first temperature sensor of control by temperature change panel detected and the second temperature value T2 that the second temperature sensor detected, the external environment temperature value Tz that detects with high accuracy temperature sensor at last, the first temperature value T1 that first temperature sensor detected and the second temperature value T2 that the second temperature sensor detected substitute the formula: R2/R1= Tz/[ T2- (T1-T2) ].
After the scheme is adopted, the first temperature sensor of the main board is used for detecting the temperature of heat conducted to the main board by the auxiliary board, and the second temperature sensor is used for detecting the temperature of an external environment; the auxiliary plate of the temperature control panel is provided with a main heating device which is a main heating source of the temperature control panel, so that heat conducted to the main plate by the auxiliary plate is a main interference source for interfering the accuracy of data detected by the second temperature sensor; therefore, the temperature control panel can accurately detect the temperature of the external environment by detecting the temperature of the heat conducted to the main board by the auxiliary board through the first temperature sensor to correct the detection data of the second temperature sensor.
Drawings
FIG. 1 is a cross-sectional view of a temperature control panel of the present invention;
FIG. 2 is a schematic structural diagram 1 of a main board of a temperature control panel according to the present invention;
FIG. 3 is a schematic structural diagram of a main board of a temperature control panel according to the present invention 2;
FIG. 4 is a schematic view of a sub-plate of the temperature control panel of the present invention 1;
FIG. 5 is a schematic view of the construction of the sub-plate of the temperature control panel of the present invention, FIG. 2;
FIG. 6 is a block circuit diagram of a portion of the temperature control panel of the present invention;
FIG. 7 is a schematic circuit diagram of an adjustable power supply circuit of the temperature control panel of the present invention;
FIG. 8 is an equivalent thermal circuit model of the first temperature sensor, the second temperature sensor and the external environment of the temperature control panel according to the present invention;
description of reference numerals:
the housing 1, the detection opening 10,
a main board 2, a main circuit board 20, a main board connector 201, a first temperature sensor 21, a second temperature sensor 22, an MCU processor 23,
the sub-board 3, the sub-board 30, the sub-board connector 301, the power module 31, the relay 32,
an insulating and heat-insulating board 4 is provided,
the turning knob (5) is provided with a rotary knob,
a display screen 6.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
As shown in fig. 1 to 8, the present invention discloses a temperature control panel, which comprises a housing 1, and a main board 2 and a sub-board 3 disposed in the housing 1; the auxiliary board 3 comprises an auxiliary circuit board 30 and a main heating device arranged on the auxiliary circuit board 30, wherein the main heating device can comprise a power module 31 and a relay 32; the main board 2 comprises a main circuit board 20, and a first temperature sensor 21, a second temperature sensor 22 and an MCU processor 23 which are arranged on the main circuit board 20, the main circuit board 20 is connected with an auxiliary circuit board 30 and is electrically conducted, the first temperature sensor 21 is adjacent to the joint of the main circuit board 20 and the auxiliary circuit board 30, the second temperature sensor 22 is close to the shell 1, the shell 1 is correspondingly provided with a detection opening 10 with the second temperature sensor 22 so that the second temperature sensor 22 can detect the external environment temperature, and the MCU processor 23 is electrically connected with the first temperature sensor 21, the second temperature sensor 22, the power module 31 and the relay 32 respectively.
In the present invention, the first temperature sensor 21 of the main board 2 is used for detecting the temperature of the heat conducted from the sub board 3 to the main board 2, and the second temperature sensor 22 is used for detecting the temperature of the external environment; the auxiliary plate 3 of the temperature control panel is provided with a main heating device which is a main heating source of the temperature control panel, so that heat conducted by the auxiliary plate 3 to the main plate 2 is a main interference source for interfering the accuracy of data detected by the second temperature sensor 22; in this way, the temperature of the heat conducted from the auxiliary board 3 to the main board 2 is detected by the first temperature sensor 21 to correct the detection data of the second temperature sensor 22, so that the temperature control panel can accurately detect the temperature of the external environment; in addition, the first temperature sensor 21 and the second temperature sensor 22 are arranged on the main board 2, and the main heating device is arranged on the auxiliary board 3, so that a main interference source which interferes with the accuracy of the data detected by the second temperature sensor 22 can be conveniently found.
In the invention, the main circuit board 20 and the auxiliary circuit board 30 are arranged side by side and oppositely, and an interval is formed between the main circuit board 20 and the auxiliary circuit board 30, and air flows through the interval, so that the thermal resistance between the main circuit board 20 and the auxiliary circuit board 30 is large, the auxiliary circuit board 3 mainly conducts the heat of the auxiliary circuit board 3 to the main circuit board 20 of the main board 2 through the joint of the auxiliary circuit board 30 and the main circuit board 20, and the temperature of the heat conducted to the main board 2 by the auxiliary circuit board 3 can be more accurately detected by the first temperature sensor 21 adjacent to the joint of the main circuit board 20 and the auxiliary circuit board 30; an insulating and heat-insulating plate 4 is arranged between the main circuit board 20 and the auxiliary circuit board 30, and the insulating and heat-insulating plate 4 ensures that the auxiliary circuit board 3 mainly conducts heat of the auxiliary circuit board 3 to the main circuit board 20 of the main board 2 through the joint of the auxiliary circuit board 30 and the main circuit board 20. The main circuit board 20 is provided with a main board connector 201, the auxiliary circuit board 30 is provided with an auxiliary board connector 301 connected with the main board connector 24, and the main board connector 201 and the auxiliary board connector 202 can be a bus bar and a pin bar respectively, so that the main circuit board 20 and the auxiliary circuit board 30 are connected simply and conveniently; the first temperature sensor 21 is arranged adjacent to the board connector 24, so that the first temperature sensor 21 is adjacent to the connection part of the main circuit board 20 and the auxiliary circuit board 30; the first temperature sensor 21 can be positioned on one side of the main circuit board 20 close to the auxiliary circuit board 30, so that the first temperature sensor 21 can more accurately detect the temperature of the heat conducted by the auxiliary board 3 to the main board 2; the second temperature sensor 22 is arranged on the side, far away from the auxiliary circuit board 30, of the main circuit board 20, so that the influence of the heat of the auxiliary board 3 on the second temperature sensor 22 is reduced; the second temperature sensor 22 may be at the edge of the main circuit board 20 so that the second temperature sensor 22 is disposed close to the housing 1.
In the invention, the main heating device can be arranged on one side of the auxiliary circuit board 30 far away from the main circuit board 20, so that part of heat generated by the main heating device is directly radiated to the air through the shell 1, and the other part of heat is transmitted to the main circuit board 20 of the main board 2 through the auxiliary circuit board 30 and is indirectly radiated to the air through the main board 2, so that the auxiliary board 3 can be ensured to conduct the heat of the auxiliary board 3 to the main circuit board 20 of the main board 2 mainly through the connecting part of the auxiliary circuit board 30 and the main circuit board 20; the main heat generating device may include a power module 31 and a relay 32.
In the present invention, the power module 31 is provided with a voltage-regulating power supply circuit 311 with adjustable output voltage, the secondary board 3 further includes an electronic switch 33 disposed on the secondary circuit board 30, an output end of the voltage-regulating power supply circuit 311 is electrically connected to a coil of the relay 32 through the electronic switch 33, an input end and an output end of the electronic switch 33 are respectively electrically connected to the output end of the voltage-regulating power supply circuit 311 and the coil of the relay 32, and a control end of the electronic switch 33 is electrically connected to one output end of the MCU processor 23; the MCU processor 23 is electrically connected to the voltage-regulating power supply circuit 311 and controls the output voltage of the voltage-regulating power supply circuit 331.
Based on the adjustable output voltage of the voltage-regulating power supply circuit 311, when the relay 32 does not need to be closed, the MCU processor 23 controls the output voltage of the voltage-regulating power supply circuit 311 to be reduced, so that the power consumption of the voltage-regulating power supply circuit 311 is reduced; when the relay 32 needs to be closed, the MCU processor 23 first controls the output voltage of the voltage-regulating power supply circuit 311 to rise, then the MCU processor 23 controls the electronic switch 33 to be turned on to close the relay 32, and after the relay 32 is reliably closed (about 200 milliseconds), the MCU processor 23 controls the output voltage of the voltage-regulating power supply circuit 311 to decrease, thereby reducing the power consumption of the relay 32 and the voltage-regulating power supply circuit 311; as can be seen from the foregoing, the output voltage of the voltage-regulating power supply circuit 311 of the present invention is adjustable, so that the output voltage of the voltage-regulating power supply circuit 311 can be dynamically adjusted, thereby effectively reducing the power consumption of the voltage-regulating power supply circuit 311 itself and the power consumption of the relay 32 in the closed state, and further effectively reducing the heat generation of the temperature control panel itself, which is beneficial to reducing the influence of the heat generation of the temperature control panel itself on the second temperature sensor 22.
In the present invention, the voltage-regulating power supply circuit 311 includes an input rectifying filter circuit 3111 and a voltage-reducing circuit 3112; the output end of the input rectifying filter circuit 3111 is connected to the input end of the voltage-reducing circuit 3112, and the output end of the voltage-reducing circuit 3112 is the output end of the voltage-regulating power supply circuit 311; the voltage reduction circuit 3112 includes a PWM control chip U1, a resistor R1, a capacitor CT1, an inductor L1, a freewheeling diode D1, and an adjustable feedback unit 3113, where the model of the PWM control chip U1 may be OB2222LM or KP3211SGA, a Drain pin of the PWM control chip U1 is connected to an input end of the voltage reduction unit, a VDD pin of the PWM control chip U1 is connected to an anode of the capacitor CT1, a GND pin of the PWM control chip U1 is connected to a first end of the resistor R1, a cathode of the capacitor CT1, a first end of the inductor L1, and a cathode of the freewheeling diode D1, a CS pin of the PWM control chip U1 is connected to a second end of the resistor R1, a second end of the inductor L1 is connected to an output end of the voltage reduction circuit, and an anode of the freewheeling diode D1 is grounded; the adjustable feedback unit 3113 comprises an optocoupler U2, a resistor R3, a resistor R4, a capacitor C1 and a diode D2, an input negative electrode of the optocoupler U2 is grounded, an output positive electrode of the optocoupler U2 is connected with a first end of the resistor R4, a second end of the resistor R4 is connected with a first end of the resistor R2, a first end of the resistor R3 and an FB pin of the PWM control chip U1, a second end of the resistor R2 is connected with a first end of the capacitor C2 and a negative electrode of the diode D2, a positive electrode of the diode D2 is connected with an output end of the voltage reduction circuit, and a second end of the capacitor C2, a second end of the resistor R3 and an output negative electrode of the optocoupler U2 are connected with a GND pin of the PWM control chip U1; the MCU processor 23 is connected with the input anode of the optocoupler U2, and the output end of the voltage reduction circuit 31112 of the voltage regulation power supply circuit 311 is electrically connected with the coil of the relay 32 through the electronic switch 33. The MCU processor 23 controls whether the resistor R4 is connected in parallel with the resistor R3 by controlling the on/off of the optocoupler U2, so as to adjust the voltage input to the FB pin of the PWM control chip U1 by the feedback unit 3113, and further adjust the duty ratio of the PWM signal output from the CS pin of the PWM control chip U1 to adjust the output voltage of the buck circuit 3112; when the resistor R4 is connected in parallel with the resistor R3, the output voltage of the step-down circuit 3112 increases; when the resistor R4 and the resistor R3 are not connected in parallel, the output voltage of the step-down circuit 3112 is lowered.
In the present invention, the input rectifying and filtering circuit 3111 includes an inductor L2, a capacitor CT3 and a diode D3, an anode of the diode D3 is connected to the input terminal of the input rectifying and filtering circuit, a cathode of the diode D3 is connected to the first terminal of the inductor L2 and the anode of the capacitor CT2, the second terminal of the inductor L2 and the anode of the capacitor CT3 are connected to the output terminal of the input rectifying and filtering circuit 3111, and a cathode of the capacitor CT2 and the cathode of the capacitor CT3 are grounded.
In the present invention, the voltage-regulating power supply circuit 311 further includes an input protection circuit 3114, an output terminal of the input protection circuit 3114 is connected to an input terminal of the input rectification filter circuit 3111, and the input protection circuit 3114 can perform overcurrent and overvoltage protection to ensure power consumption safety; the input protection circuit 3114 may include a fuse F1 and a thermistor RT, the input of the input protection circuit 3114 is connected to the first end of the fuse F1, the output of the input protection circuit 3114 is connected to the second end of the fuse F1 and the first end of the thermistor RT, and the second end of the thermistor RT is grounded.
In the present invention, the voltage-regulating power supply circuit 311 further includes an output filter circuit 3115 connected to the output terminal of the step-down circuit 3112, and the output filter circuit 3115 can stabilize the output voltage of the step-down circuit 3112. The output filter circuit 3115 may include a capacitor CT4 and a capacitor C2, a positive electrode of the capacitor CT4 and a first end of the capacitor C2 are connected to the output terminal of the voltage-reducing circuit 3112, and a negative electrode of the capacitor CT4 and a second end of the capacitor C2 are grounded.
In the invention, the temperature control panel can also comprise a knob 5 connected with the main circuit board 20 of the main board 2, the knob 5 can be provided with a display screen 6 connected with the main circuit board 20 of the main board 1, the display screen 6 can display temperature and a function interface, and the knob 5 can select and control functions of the temperature control panel.
In the present invention, fig. 8 is an equivalent thermal circuit model of the first temperature sensor 21 and the second temperature sensor 22 of the temperature control panel of the present invention and the external environment; the total power P in fig. 8 is the total input power of the temperature control panel, the first thermal resistance R1 is the thermal resistance of the heat conduction path from the first temperature sensor 21 to the second temperature sensor 22, the second thermal resistance R2 is the thermal resistance of the heat conduction path from the second temperature sensor 22 to the external environment, the third thermal resistance R3 is the thermal resistance of the heat conduction path from the heat source of the temperature control panel to the external environment, the thermal capacitance C1 is the thermal capacitance of the temperature control panel, the first temperature value T1 is the temperature detection data of the first temperature sensor 21, the second temperature value T2 is the temperature detection data of the second temperature sensor 22, and the temperature of the external environment is T0; and the power of the temperature controlled panel flowing between the first temperature sensor 21 and the second temperature sensor 22 is P12. This makes it possible to obtain:
R1*P12=T1-T2；
P12=（T1-T2）/R1；
since the first thermal resistance R1 and the second thermal resistance R2 are in series, the power of the external environment of the flow channel via the second temperature sensor 22 is also P12, and then:
R2*P12=T1-T0；
R2*（T1-T2）/R1=T2-T0；
T0=T2-（T1-T2）*(R2/R1)；
in the present invention, after the temperature control panel is assembled, R2/R1 is a constant, so that the actual external environment temperature can be calculated by the temperature detection data of the first temperature sensor 21 and the second temperature sensor 22 only by experimentally measuring the size of R2/R1 in a stable working state. Therefore, the present invention also provides an external environment temperature detection method based on the temperature control panel, which comprises the following steps:
under the external environment with stable temperature, measuring the ratio of a first thermal resistance R1 and a second thermal resistance R2 of the temperature control panel; when the control by temperature change panel detected external environment temperature, first temperature sensor carried out temperature detection and obtained first temperature value T1, and second temperature sensor also carried out temperature detection and obtained second temperature value T2, and the MCU treater of control by temperature change panel was with first temperature value T1, second temperature value T2, first thermal resistance R1 and the substitution formula of second thermal resistance R2: t0= T2- (T1-T2) × (R2/R1), giving the external ambient temperature T0.
In the invention, the method for measuring the ratio of the first thermal resistance R1 and the second thermal resistance R2 of the temperature control panel comprises the following steps: place control by temperature change panel and high accuracy temperature sensor in the stable external environment of temperature, then read the external environment temperature value Tz that high accuracy temperature sensor detected and the first temperature value T1 that first temperature sensor 21 of control by temperature change panel detected and the second temperature value T2 that second temperature sensor 22 detected, finally substitute the external environment temperature value Tz that high accuracy temperature sensor detected, the first temperature value T1 that first temperature sensor 21 detected and the second temperature value T2 that second temperature sensor 22 detected into the formula: R2/R1= Tz/[ T2- (T1-T2) ].
The above embodiments and drawings are not intended to limit the form and style of the product of the present invention, and any suitable changes or modifications thereof by one of ordinary skill in the art should be considered as not departing from the scope of the present invention.
Claims (12)
1. A temperature control panel, comprising: comprises a shell, a main board and an auxiliary board which are arranged in the shell;
the auxiliary board comprises an auxiliary circuit board and a main heating device arranged on the auxiliary circuit board;
the main board comprises a main circuit board, and an MCU processor, a first temperature sensor and a second temperature sensor which are arranged on the main circuit board; the main circuit board is connected with the auxiliary circuit board and is electrically conducted, the first temperature sensor is adjacent to the joint of the main circuit board and the auxiliary circuit board, the second temperature sensor is close to the shell, the shell corresponds to the second temperature sensor and is provided with a detection opening, and the MCU processor is electrically connected with the first temperature sensor, the second temperature sensor, the power module and the relay respectively.
2. The temperature control panel of claim 1, wherein: the main circuit board and the auxiliary circuit board are arranged oppositely side by side, and an interval is formed between the main circuit board and the auxiliary circuit board.
3. The temperature control panel of claim 2, wherein: and an insulating and heat insulating plate is arranged between the main circuit board and the auxiliary circuit board.
4. The temperature control panel of claim 1 or 2, wherein: the main heating device is arranged on one side of the auxiliary circuit board far away from the main circuit board.
5. The temperature control panel of claim 1, wherein: the main heating device comprises a power supply module and a relay.
6. The temperature control panel of claim 5, wherein: the power module is provided with a voltage-regulating power circuit with adjustable output voltage, the auxiliary board further comprises an electronic switch arranged on the auxiliary circuit board, the output end of the voltage-regulating power circuit is electrically connected with the coil of the relay through the electronic switch, the input end and the output end of the electronic switch are respectively electrically connected with the output end of the voltage-regulating power circuit and the coil of the relay, and the control end of the electronic switch is electrically connected with one output end of the MCU processor; the MCU processor is electrically connected with the voltage-regulating power supply circuit and controls the output voltage of the voltage-regulating power supply circuit.
7. The temperature control panel of claim 6, wherein: the voltage-regulating power supply circuit comprises an input rectification filter circuit and a voltage reduction circuit; the output end of the input rectification filter circuit is connected with the input end of the voltage reduction circuit; the voltage reduction circuit comprises a PWM control chip U1, a resistor R1, a capacitor CT1, an inductor L1, a freewheeling diode D1 and an adjustable feedback unit, wherein a Drain pin of the PWM control chip U1 is connected with the input end of the voltage reduction unit, a VDD pin of the PWM control chip U1 is connected with the anode of the capacitor CT1, a GND pin of the PWM control chip U1 is connected with the first end of the resistor R1, the cathode of the capacitor CT1, the first end of the inductor L1 and the cathode of the freewheeling diode D1, a CS pin of the PWM control chip U1 is connected with the second end of the resistor R1, the second end of the inductor L1 is connected with the output end of the voltage reduction circuit, and the anode of the freewheeling diode D1 is grounded; the adjustable feedback unit comprises an optical coupler U2, a resistor R3, a resistor R4, a capacitor C1 and a diode D2, the input negative electrode of the optical coupler U2 is grounded, the output positive electrode of the optical coupler U2 is connected with the first end of the resistor R4, the second end of the resistor R4 is connected with the first end of the resistor R2, the first end of the resistor R3 and the FB pin of the PWM control chip U1, the second end of the resistor R2 is connected with the first end of the capacitor C2 and the negative electrode of the diode D2, the positive electrode of the diode D2 is connected with the output end of the voltage reduction circuit, and the second end of the capacitor C2, the second end of the resistor R3 and the output negative electrode of the optical coupler U2 are connected with the GND pin of the PWM control chip U1;
the MCU treater is connected the input positive pole of opto-coupler U2, and the output of the voltage reduction circuit of voltage regulation power supply circuit passes through the coil of electronic switch electricity connection relay.
8. The temperature control panel of claim 1 or 2, wherein: the main circuit board is provided with a main board connector, and the first temperature sensor is arranged adjacent to the main board connector; the auxiliary circuit board is provided with an auxiliary board connector connected with the main board connector.
9. The temperature control panel of claim 1, wherein: the first temperature sensor is arranged on one side, close to the auxiliary circuit board, of the main circuit board.
10. The temperature control panel of claim 1, wherein: the second temperature sensor is positioned on one side of the main circuit board far away from the auxiliary circuit board; the second temperature sensor is arranged at the edge of the main circuit board.
11. A method for detecting the temperature of the external environment based on the temperature control panel as claimed in any one of claims 1 to 10, wherein:
under the external environment with stable temperature, measuring the ratio of a first thermal resistance R1 and a second thermal resistance R2 of the temperature control panel; the first thermal resistance R1 is a thermal resistance of a heat conduction path between the first temperature sensor and the second temperature sensor, and the second thermal resistance R2 is a thermal resistance of a heat conduction path between the second temperature sensor of the temperature control panel and the external environment;
when the control by temperature change panel carries out temperature detection to external environment, first temperature sensor carries out temperature detection and obtains first temperature value T1, and second temperature sensor also carries out temperature detection and obtains second temperature value T2, and the MCU treater of control by temperature change panel substitutes first temperature value T1, second temperature value T2, first thermal resistance R1 and second thermal resistance R2 into the formula: t0= T2- (T1-T2) × (R2/R1), giving the external ambient temperature T0.
12. The outside environment temperature detection method according to claim 11, characterized in that: the method for measuring the ratio of the first thermal resistance R1 to the second thermal resistance R2 of the temperature control panel comprises the following steps:
place control by temperature change panel and high accuracy temperature sensor in the stable external environment of temperature, then read the external environment temperature value Tz that high accuracy temperature sensor detected and the first temperature value T1 that the first temperature sensor of control by temperature change panel detected and the second temperature value T2 that the second temperature sensor detected, the external environment temperature value Tz that detects with high accuracy temperature sensor at last, the first temperature value T1 that first temperature sensor detected and the second temperature value T2 that the second temperature sensor detected substitute the formula: R2/R1= Tz/[ T2- (T1-T2) ].
Priority Applications (1)
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